Stored procedure accessing system table

Question

I am using a stored procedure to access tables in other schemas. I pass the schema and table name as parameters to the stored procedure. I use these two variables to create a cursor of column names from all_tab_columns table. When I access all_tab_columns from SQL Plus, the right result is returned. When the procedure executes the same select statement in the same schema and using the same search criteria, the table I am looking for can not be found.
Example:
select count(column_name) from all_tab_columns where owner = 'MYADM' and table_name = 'MYTABLE';
This will return the correct number of columns when executed in SQL Plus.
cursor mycursor is
select count(column_name) from all_tab_columns where owner = p_owner and table_name = p_table;
This cursor, when used in my stored procedure, finds nothing when p_owner is set to MYADM and p_table is set to MYTABLE.
I've tried granting all permissions to the calling schema with no positive results. I am aware that the calling schema is not required to have the necessary privileges when a procedure accesses data in other schemas. So I don't understand what the problem is. I greatly appreciate anyone's help.
Cyrus

Answer 1

Hi,
try this, probaly this'll give you the desired output :
Procedure Column_cnt
( p_owner IN varchar2,
p_table IN varchar2 ) IS
cursor c1 is
select count(column_name) col_cnt from all_tab_columns where owner = upper(p_owner)
and table_name = upper(p_table);
BEGIN
for i in c1 loop
dbms_output.put_line(i.col_cnt);
end loop;
END;
Now from SQLPLUS type :
exec column_cnt('OWNER','TABLE_NAME')
Note: parameters are in Varchar2, so they should be within quotes.
But do you really want a cursor to store a single row, single column value, cursors are for fetching multiple rows/columns that means for a result set.
if you want to get only count(column_name) then you could re-write the procedure like this way :
Procedure Column_cnt
( p_owner IN varchar2,
p_table IN varchar2 ) IS
col_cnt number;
BEGIN
select count(column_name) into col_cnt from all_tab_columns where owner = upper(p_owner)and table_name = upper(p_table);
dbms_output.put_line(i.col_cnt);
END;
Thanks
<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by cyrus eslami ([email protected]):
I am compiling and invoking the procedure in a schema that has the correct privileges granted to it.
-Cyrus<HR></BLOCKQUOTE>
null